Make possible to use sprockets-rails 2.1

Gemfile

@@ -11,6 +11,7 @@ gem 'rack-cache', '~> 1.2'
 gem 'jquery-rails', '~> 3.1.0'
 gem 'turbolinks'
 gem 'coffee-rails', '~> 4.0.0'
+gem 'sprockets-rails', github: 'rails/sprockets-rails'
 
 # require: false so bcrypt is loaded only when has_secure_password is used.
 # This is to avoid ActiveModel (and by extension the entire framework)

rails.gemspec

@@ -27,5 +27,5 @@ Gem::Specification.new do |s|
   s.add_dependency 'railties',      version
 
   s.add_dependency 'bundler',         '>= 1.3.0', '< 2.0'
-  s.add_dependency 'sprockets-rails', '~> 2.0.0'
+  s.add_dependency 'sprockets-rails', '~> 2.1'
 end